The hex color #3f15cd is a dark color. The web-safe version is Hex
#3300CC. A complementary color is
#C0EA32. The grayscale version is
#606060. A 20% lighter version of the original color is
#7248FF, and Hex
#0C009A is the 20% darker color. If the color is saturated by 10%, you get
#3C0DD8. If the color is desaturated by 10%, the color
#421DC2 is obtained.